const path = require("path");
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const CssMinimizerPlugin = require("css-minimizer-webpack-plugin");
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ESLintPlugin = require('eslint-webpack-plugin')
const CopyWebpackPlugin = require("copy-webpack-plugin")

module.exports = {
    //入口文件
    entry: path.resolve(__dirname,"../src/index.js"),
    //出口文件
    output: {
        path: path.resolve(__dirname, "../bulid"),
        filename: "main.js"
    },
    //模块配置，配置loader
    module: {
        rules: [{
            test: /\.css$/i,
            use: [MiniCssExtractPlugin.loader,"css-loader"]
        },{
            test: /\.less$/i,
            use: [MiniCssExtractPlugin.loader,"css-loader","less-loader"]
        },{
            test: /\.(png|jpg|gif|webp)$/,
            //asset 在导出一个 data URI 和发送一个单独的文件之间自动选择。代替之前的url-loader和file-loader
            type: "asset",
            parser: {
                dataUrlCondition: {
                    maxSize: 30 * 1024, // 小于15kb以下的图片会被打包成base64格式
                },
            },
            generator: {
                filename: 'images/[name][ext]'
            }
        }]
    },
    //优化
    optimization: {
        minimizer: [
          new CssMinimizerPlugin(),
        ],
      },
    //插件配置
    plugins: [new MiniCssExtractPlugin({
        //输出独立文件的文件名
        filename: 'css/index.css'
    }),new HtmlWebpackPlugin({
        filename: "index.html",
        template: path.resolve(__dirname,"../public/index.html"),
        minify: {
            collapseWhitespace: true,
            keepClosingSlash: true,
            removeComments: true,
            removeRedundantAttributes: true,
            removeScriptTypeAttributes: true,
            removeStyleLinkTypeAttributes: true,
            useShortDoctype: true
        } 
    }),new ESLintPlugin({
        fix: true
    }),new CopyWebpackPlugin({
        patterns: [{
            from: path.resolve(__dirname,"../public"),
            to: "public",
            globOptions: {
                ignore: ["**/index.html"]
            }
        }],
    }),],
     //打包模式
    mode: "production", //还有development模式
}